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PHILADELPHIA (CBS) – The first official week of summer is really feeling like summer as our second heat wave of the year is underway.

Monday was day one of the heat wave, with a high of 92 degrees.

On Tuesday, temperatures made it into the low 90s once again, but with the added humidity it feels more like the mid 90s.

Wednesday will make it an official heat wave, as high temperatures reach the low to mid 90s with heat indices in the upper 90s. This will not be record-breaking heat since our record highs this time of year are in the upper 90s to around 100 degrees.

A heat advisory will go into effect for Philadelphia and the surrounding suburbs on Wednesday from 11 a.m. – 8 p.m. Heat is one of the top causes of weather related deaths, so staying cool and drinking plenty of water is very important. The high heat and humidity each day will bring a chance for a shower and thunderstorm in the afternoon and evening. Temperatures will drop back into the 80s by the end of the week as an approaching cold front brings more clouds and chances for showers and storms.